Question 1

Compared to other types of magma, basalt ____.

Accepted Answer

A) has lower viscosity, but equivalent silica content 
B) has lower viscosity and higher silicate content 
C) has higher viscosity and lower silicate content 
D) has higher viscosity and higher silicate content 
E) has lower viscosity and lower silicate content 
A) has lower viscosity, but equivalent silica content 
B) has lower viscosity and higher silicate content 
C) has higher viscosity and lower silicate content 
D) has higher viscosity and higher silicate content 
E) has lower viscosity and lower silicate content

Question 2

Volcanic eruptions are likely to be more explosive for magmas that have ____.

Accepted Answer

A) high viscosity and a low amount of volatiles 
B) high viscosity and a high amount of volatiles 
C) low viscosity and a high amount of volatiles 
D) low viscosity and a low amount of volatiles 
E) any viscosity with a high amount of volatiles 
A) high viscosity and a low amount of volatiles 
B) high viscosity and a high amount of volatiles 
C) low viscosity and a high amount of volatiles 
D) low viscosity and a low amount of volatiles 
E) any viscosity with a high amount of volatiles

Question 3

A mix of volcanic ash and water that pours downslope from a volcano is a(n) _______________.

Accepted Answer

The answer of A mix of volcanic ash and water...

Question 4

Small, explosive basalt volcanoes formed at continental rifts and the flanks of shield volcanoes are ____.

Accepted Answer

A) resurgent caldera 
B) lava domes 
C) cinder cones 
D) stratovolcanoes 
E) shield volcanoes ​ 
A) resurgent caldera 
B) lava domes 
C) cinder cones 
D) stratovolcanoes 
E) shield volcanoes ​

Question 5

_______________ is black or brownish black, contains significant amounts of calcium and iron, and flows fluidly.

Accepted Answer

The answer of _______________ is black or brownish black, contains...

Question 6

When an eruption cloud spills downslope from the crater rim, it forms a(n) _______________ flow.

Accepted Answer

The answer of When an eruption cloud spills downslope from...

Question 7

Basaltic magma eruptions usually take which form?

Accepted Answer

A) lava flows 
B) pale ash flows 
C) lahar 
D) steam-rich explosions 
E) ash-rich explosions 
A) lava flows 
B) pale ash flows 
C) lahar 
D) steam-rich explosions 
E) ash-rich explosions

Question 8

The term _______________ refers to how fluid magma is.

Accepted Answer

The answer of The term _______________ refers to how fluid...

Question 9

Name and describe the three types of major volcanoes (exclude lava domes and continental calderas). Identify their rock composition, shape, and the viscosity and composition of the magma that created them.

Accepted Answer

A correct answer must include all of the

Question 10

A caldera is formed ____.

Accepted Answer

A) when seawater reacts with hot basalt 
B) in volcanoes which do not have enough steam pressure to support solidified magma 
C) from pyroclastic flows 
D) when volcanoes form in freshwater lakes 
E) by the collapse of a magma chamber 
A) when seawater reacts with hot basalt 
B) in volcanoes which do not have enough steam pressure to support solidified magma 
C) from pyroclastic flows 
D) when volcanoes form in freshwater lakes 
E) by the collapse of a magma chamber

Question 11

The volume of magma expelled in an eruption depends on ____ of the magma.

Accepted Answer

A) the temperature and volatiles but not the viscosity 
B) the temperature and viscosity but not the volatiles 
C) both the viscosity and volatiles 
D) only the volatiles 
E) the temperature, viscosity, and volatiles 
A) the temperature and volatiles but not the viscosity 
B) the temperature and viscosity but not the volatiles 
C) both the viscosity and volatiles 
D) only the volatiles 
E) the temperature, viscosity, and volatiles

Question 12

How are pyroclastic flows created and why are they dangerous?

Accepted Answer

A volcano with a viscous magma content w

Question 13

Pumice is ____.

Accepted Answer

A) created in explosive eruptions involving viscous magma and high amounts of volatiles 
B) the solidified form of a lahar that has reached the sea 
C) compacted volcanic ash 
D) "clinkers" of basalt formed in slow lava flows 
E) created in slow eruptions involving fluid magma and low amounts of volatiles 
A) created in explosive eruptions involving viscous magma and high amounts of volatiles 
B) the solidified form of a lahar that has reached the sea 
C) compacted volcanic ash 
D) "clinkers" of basalt formed in slow lava flows 
E) created in slow eruptions involving fluid magma and low amounts of volatiles

Question 14

A resurgent dome ____.

Accepted Answer

A) forms in the collapsed magma chamber of a stratovolcano or shield volcano 
B) is a precursor to an eruption of a shield volcano 
C) is a precursor to an eruption of a stratovolcano 
D) is a pumice formation created by the release of volatile gasses 
E) forms inside of a continental caldera 
A) forms in the collapsed magma chamber of a stratovolcano or shield volcano 
B) is a precursor to an eruption of a shield volcano 
C) is a precursor to an eruption of a stratovolcano 
D) is a pumice formation created by the release of volatile gasses 
E) forms inside of a continental caldera

Question 15

Most hazardous volcanoes occur near subduction zones.

Accepted Answer

A) True 
 B)False

Question 16

Pyroclastic flows are dangerous because they ____.

Accepted Answer

A) contain poisonous sulfur compounds 
B) cause magma chamber collapse 
C) move very fast, and extend a long distance 
D) move very fast over a short distance 
E) move at unpredictable speeds 
A) contain poisonous sulfur compounds 
B) cause magma chamber collapse 
C) move very fast, and extend a long distance 
D) move very fast over a short distance 
E) move at unpredictable speeds

Question 17

Volcanoes with large, steep-sided cones, called _______________-volcanoes, often form near subduction zones.

Accepted Answer

The answer of Volcanoes with large, steep-sided cones, called _______________-volcanoes,...

Question 18

Lava domes and continental calderas cannot produce pyroclastic flows.

Accepted Answer

A) True 
 B)False

Question 19

A subduction zone provides an environment that affects the types of volcanoes that develop there because ____.

Accepted Answer

A) the subducting slab is subjected to high pressure 
B) the continental slab is composed of denser material than the subducting slab 
C) the magma will reach the surface more quickly 
D) the subducting crust is high in silicates 
E) there is a high water content in the rock of the subducting slab 
A) the subducting slab is subjected to high pressure 
B) the continental slab is composed of denser material than the subducting slab 
C) the magma will reach the surface more quickly 
D) the subducting crust is high in silicates 
E) there is a high water content in the rock of the subducting slab

Question 20

Pahoehoe lava has a ropy, smooth, or billowy surface.

Accepted Answer

A) True 
 B)False

Compared to other types of magma, basalt ____.

Volcanic eruptions are likely to be more explosive for magmas that have ____.

A mix of volcanic ash and water that pours downslope from a volcano is a(n) _______________.

Small, explosive basalt volcanoes formed at continental rifts and the flanks of shield volcanoes are ____.

_______________ is black or brownish black, contains significant amounts of calcium and iron, and flows fluidly.

When an eruption cloud spills downslope from the crater rim, it forms a(n) _______________ flow.

Basaltic magma eruptions usually take which form?

The term _______________ refers to how fluid magma is.

Name and describe the three types of major volcanoes (exclude lava domes and continental calderas). Identify their rock composition, shape, and the viscosity and composition of the magma that created them.

A caldera is formed ____.

The volume of magma expelled in an eruption depends on ____ of the magma.

How are pyroclastic flows created and why are they dangerous?

Pumice is ____.

A resurgent dome ____.

Most hazardous volcanoes occur near subduction zones.

Pyroclastic flows are dangerous because they ____.

Volcanoes with large, steep-sided cones, called _______________-volcanoes, often form near subduction zones.

Lava domes and continental calderas cannot produce pyroclastic flows.

A subduction zone provides an environment that affects the types of volcanoes that develop there because ____.

Pahoehoe lava has a ropy, smooth, or billowy surface.

Natural Hazards and Disasters

Plate Tectonics and Physical Hazards

Earthquakes and Their Causes

Earthquake Predictions Forecasts and Mitigation

Tsunami

Volcanoes Hazards and Mitigation

Landslides and Other Downslope Movements

Sinkholes Land Subsidence and Swelling Soils

Weather Thunderstorms and Tornadoes

Climate Change Processes and History

Climate Change Impacts and Mitigation

Streams and Flood Processes

Floods and Human Interactions

Waves Beaches and Coastal Erosion

Hurricanes and nor Easters

Wildfires

Asteroid and Comet Impacts

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Exam 6: Volcanoes Tectonic Environments and Eruptions

Compared to other types of magma, basalt ____.

Volcanic eruptions are likely to be more explosive for magmas that have ____.

A mix of volcanic ash and water that pours downslope from a volcano is a(n) _______________.

Small, explosive basalt volcanoes formed at continental rifts and the flanks of shield volcanoes are ____.

_______________ is black or brownish black, contains significant amounts of calcium and iron, and flows fluidly.

When an eruption cloud spills downslope from the crater rim, it forms a(n) _______________ flow.

Basaltic magma eruptions usually take which form?

The term _______________ refers to how fluid magma is.

Name and describe the three types of major volcanoes (exclude lava domes and continental calderas). Identify their rock composition, shape, and the viscosity and composition of the magma that created them.

A caldera is formed ____.

The volume of magma expelled in an eruption depends on ____ of the magma.

How are pyroclastic flows created and why are they dangerous?

Pumice is ____.

A resurgent dome ____.

Most hazardous volcanoes occur near subduction zones.

Pyroclastic flows are dangerous because they ____.

Volcanoes with large, steep-sided cones, called _______________-volcanoes, often form near subduction zones.

Lava domes and continental calderas cannot produce pyroclastic flows.

A subduction zone provides an environment that affects the types of volcanoes that develop there because ____.

Pahoehoe lava has a ropy, smooth, or billowy surface.

Natural Hazards and Disasters

Plate Tectonics and Physical Hazards

Earthquakes and Their Causes

Earthquake Predictions Forecasts and Mitigation

Tsunami

Volcanoes Hazards and Mitigation

Landslides and Other Downslope Movements

Sinkholes Land Subsidence and Swelling Soils

Weather Thunderstorms and Tornadoes

Climate Change Processes and History

Climate Change Impacts and Mitigation

Streams and Flood Processes

Floods and Human Interactions

Waves Beaches and Coastal Erosion

Hurricanes and nor Easters

Wildfires

Asteroid and Comet Impacts

Filters